Hello Tom, I have been following as best as I can. Stone cold as new with matching accessories, are trading at $3000. The dash 2s seem to sell a little better. I guess the the long extractor scares some people off.
Just so you load the chamber from the magazine, no problem. The OPs box may be a factory replacement when the the 52 was returned for some work by the factory? $1700 for the OPs 52 sounds fair. If the mags have the steel figure eight followers. Best

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Mike 2796
SoFo Bunch member